HP LaserJet 4345
Hi,

How to Identify and Fix Common printer Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced technical support :

Turn off the printer, and then unplug the power cord from the electrical outlet. Remove any paper from the input tray. Open the rear access door, and then clean the paper feed rollers with a lint-free cloth lightly moistened with filtered water. Wait 10 minutes for the rollers to dry.
Sometimes a paper jam error persists even though there is no jammed paper (false paper jam). Reset the printer, which might clear a false paper jam error, and then try to print again. With the printer turned on, disconnect the power cord from the printer. Unplug the power cord from the power source.
Dirty printer rollers. If your paper jams are happening randomly and you can`t identify the cause, it could be that your printer rollers are dirty. Over time, dust and debris can build up on the rollers and cause the rollers to grab onto paper unevenly, which can lead to paper jams.
Open the front door on the printer. Remove the toner cartridge from the printer. Lift the jam-access cover and slowly remove any jammed paper. Be careful not to tear the paper.
More often than not, repeated “paper jams” are a false alarm caused by accumulated dirt or ink on the image sensor that cause the scanner to stop. Simply cleaning the scanner can solve this problem.
A piece of paper stuck in the paper tray or inside the printer can create a paper jam. Paper jams can occur for a variety of reasons, such as overloading the paper tray, loading different thicknesses of paper in the tray, or using paper that isn`t appropriate for your particular printer.
If your printer won`t print, a print job has stopped unexpectedly, or you received a “carriage jam” error, your printer carriage is likely jammed. These jams occur when the carriage holding the ink cartridges stalls in the printer. Carriage jams sometimes occur after a paper jam.
A piece of paper stuck in the paper tray or inside the printer can create a paper jam. Paper jams can occur for a variety of reasons, such as overloading the paper tray, loading different thicknesses of paper in the tray, or using paper that isn`t appropriate for your particular printer.
Dust, paper fiber, and other debris might accumulate on the paper feed rollers and cause paper jams and paper feed issues. Clean the rollers inside the printer, and then try to print again.
Reason #1: Bad, Old, or Warped Paper

Once they return to the office, it`s likely that some paper has been sitting in printer trays for quite some time, and old paper can cause a printer jam. This is often due to the varying levels of humidity that the paper sheets have experienced while collecting dust in the office.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Optional 250 Sheet Feeder Tray (Q5931A – Tray 3) Constantly "Jams"
ANSWER : You don’t say if the paper moves at all. That’s key in determining the cause. If it’s not moving, then try swapping the rollers with tray 2. If it is moving out of the tray, then that would indicate there is some obstruction it is hitting on its way out of the tray. Hard to troubleshoot remotely when one doesn’t have specific details since we can’t see what is occurring.

Read Full Q/A … :

HP LaserJet 4345

Consistently jams in tray 3.
ANSWER : If it prints OK from tray 2, then there is some sort of obstruction in the pathway coming out of tray 3 up to tray 2.

Read Full Q/A … :

HP LaserJet 4345

Paper jam in tray 2 (but no paper pulled from tray) also M476DN models
ANSWER : Isopropyl alcohol is not recommended for rubber rollers. It dries out the rubber and hasten it’s cracking and breaking. It will do nothing to restore the grip. Those rollers are really hard to replace. It would be easy if that dumbass secondary menu really worked. None of the techs I’ve spoke to ever got into it. Everyone I know sends a print job and listens for the roller to rotate into position where you can pull it off.

Read Full Q/A … :

HP LaserJet 4345

hp 8600 pro when power on, paper jam message appear but there is no paper jam in the tray
ANSWER : Hp 8180 Photosmart All In One code keeps says paper jam and carriage jam when neither are jammed. I followed all the recommended things to do. I live in Raleigh NC any place to take this or any suggestion.

Read Full Q/A … :

HP LaserJet 4345

Paper Jam and carriage jam code when nothing is jammed
ANSWER : Did you try cleaning the encoder strip that runs through the cartridge assy.? Use Window Cleaner on a paper towel. Also, check inside on the right. I’ve seen a lot of times where there is a folded up scrap of paper that stops the carriage from going all the way to the right.

Read Full Q/A … :

HP LaserJet 4345

paper jam
ANSWER : If you remove the fuser (2 screws), look to the left and you’ll see a gear on a metal bracket. That’s the coupling gear. It drives the fuser. You’ll see that it is yellow with teeth missing. You’ll need to replace it. You have to take the formatter assy. to the left of it off, and then there are a few screws holding it in place.

Read Full Q/A … :

HP LaserJet 4345

Paper Jam Tray 1
ANSWER : Tray No. 1 (the feeder) has to be either FULLY closed or FULLY down, down to about a 45 degree angle. Then hit the OK button and it should Initialize and start working. This solution is for when there is actually NO paper jamming the printer.

Read Full Q/A … :

HP LaserJet 4345

LaserJet 4 won't Power Up
ANSWER : I haven’t seen that particular behavior on that model. It either works or it doesn’t. My first choice would be the power supply.

Read Full Q/A … :

HP LaserJet 4345